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PULSED SIGNALS DISTORTIONS IN MULTICHANNEL CONERENT DETECTION TRANSMISSION SYSTEMS CAUSED BY SELF-PHASE MODULATION AND CROSS-PHASE MODULATION IN OPTICAL FIBER
Anatoly N. Sychuk, Federal State-Financed Educational Institution of Higher Education «Siberian State University of Telecommunications and Information Sciences» (SibSUTIS), Novosibirsk, Russia, tolya030394@mail.ru
Vardges A. Vardanyan, Federal State-Financed Educational Institution of Higher Education «Siberian State University of Telecommunications and Information Sciences» (SibSUTIS), Novosibirsk, Russia, vardgesvardanyan@mail.ru
Abstract
The self-phase modulation (SPM) and the cross-phase modulation (XPM) effects influence, depending on transmitting system parameters and affecting noise immunity of pulsed signals to be transmitted of the multichannel wavelength division multiplexing transmitting system is investigated. The investigation is carried out under the conditions of transmitting system parameters variation: the total optical power level in optical fiber and the linear code type. At the receiver after the coherent photodetection of pulsed signals the eye diagrams obtained are analyzed. The estimate criterion of the SPM and XPM effects influence affecting noise immunity of pulsed signals is Q-factor to be calculated by graphic method with an eye diagram. The simulation model of the multichannel wavelength division multiplexing transmitting system is implemented in the environment MathCAD modeling. The SPM and XPM effects influence is simulated as the pulsed signal phase distortions in the signal propagation process through standard single mode optical fiber. With coherent photodetecting the pulsed signal phase distortions are transformed to the pulsed signal amplitude distortions. In the paper deals with the SPM and XPM effects influence affecting noise immunity of pulsed signals is dependent on transmitting system parameters. The simulations shown, the signal quality index is decreased while increasing the total optical signal power level. When the total optical signal power level is increasing from 2 mW to 30 mW, for 128-channel transmitting system 40 Gbps the signal Q-factor is reduced by 8 times for NRZ-code and it is reduced by 9 times for RZ-code, correspondingly. In addition, the simulations showed that transition from NRZ-code to RZ-code allows one to increase value of Q-factor by average 1.7 times. The obtained results can be used to estimate one the potential penalty on signal noise immunity due to the SPM and XPM effects influence in the designed multichannel wavelength division multiplexing transmitting system.
Keywords: nonlinear effects, self-phase modulation, cross-phase modulation, wavelength division multiplexing, coherent detection, signal noise immunity.
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Information about authors:
Anatoly N. Sychuk, postgraduate, Federal State-Financed Educational Institution of Higher Education «Siberian State University of Telecommunications and Information Sciences» (SibSUTIS), Novosibirsk, Russia
Vardges A. Vardanyan, Doctor of Engineering Science, Professor, Department of Multichannel Electrical Communication and Optical Systems, Federal State-Financed Educational Institution of Higher Education «Siberian State University of Telecommunications and Information Sciences» (SibSUTIS), Novosibirsk, Russia